Improvement in sheet-metal-bending tools



I. E. HUNTER.

SHEET-METAL BENDING TOOLS. N0.178,Z99. Patented June 6,1876.

NPEI'ERSI PHDTO-LITHOGRAPHER. WASHINGTON. D C.

IUZNITED STATES PATENT Ger-Ion JOHN E. HUNTER, OF MEOHANIGSBURG, OHIO.

IMPROVEMENT IN SHEET-METAL-BENDINGTOOLS.

Specification forming part of LettersPatent No. 178,299, dated June 6,1876; application file March 16, 1876.

To all whom it may concern:

- Be it known that I, JOHN E. HUNTER, 0 Mechanicsburg, in the county ofGhampaign and State of Ohio, have invented certain Improvements inMachine for Swaging and Tapering Stove-Pipe, of which the following is aspecification My invention consists of a pair of taper and fluted orgrooved rolls, mounted in a frame in such a manner that they can beadjusted at will, and made to rotate for the purpose of swaging andcrimping or tapering the ends of stove-pipe, as hereinafter more fullydescribed.

Figure l is a side elevation, shown partly in section; and Fig.2 is anend view.

My invention consists of two taper fluted and beaded rolls, mounted in aframe in such a manner that when their axes are parallel, the ribs orfluting of the rolls shall engage at their larger ends, while theirouter ends are separated, the rolls thus serving to drive each other bymeans of the ribs, which also produce the corrugations in the pipe,thereby'dispensing with the pinions or gear ordinarily used in machinesof this class, as hereinafter more fully set forth. a

through the standard or frame (J, and is journaled so as to revolvetherein, while its opposite end is provided with a crank, H, by whichthe lower roll, thus mounted, can be turned. A spiral spring, 0, isarranged between the frame and the shaft of the upper roll, which tendsto raise said roll, while above the same, in a cross-bar, f, of theframe, is inserted a screw, D, having a crank, by which the upper rollcan be pressed down upon the lower roll, or adjusted in referencethereto at any desired position.

The corrugations or grooves on the rolls fit like teeth on a cog-wheel,the rolls being so mounted or arranged that they will touch at theirlarger ends, while being slightly apart at their opposite ends, as shownin-Fig. 1, so that by turning the crank H the two rolls are caused torotate together.

by turning the crank H, the rolls are made to rotate, carrying the pipearound also, .the beadse and the grooves a forming a bead on the pipe asit rotates, the fluted rolls at the same time corrugating the end of thepipe longitudinally, and reducing it in diameter. It will be seen that,as the rolls are arranged so that the ribs thereon mesh deeper as theyapproach the larger ends, the corrugations will be correspondinglydeepest at the extreme end of the pipe, and will decrease from thatpoint inward toward the annular bead, beyond which they will in noinstance extend, and that as a consequence of this the end of the pipewill have, when done, a regular taper, which will enable it to be shovedinto the end of another joint not thus reduced with ease, and so as tomake a tight fit.

By these means the pipe is both beaded and tapered at one and the'sameoperation.

The machine is exceedingly simple, there,

being no cog-wheels or other devices liable to break or get out oforder. The rolls, being slipped endwise on their shafts, can be readilyremoved and changed whenever desired.

I am aware that taper fluted rolls without beads have been used, andalso that cylindrical fluted rolls with beads have been used forcrimping the ends of stove-pipe; but in all such cases pinions or otheradditional mechanism are used for imparting motion from'one roll to theother.

Having thus described my invention, what I claim isj Theherein-described machine, consisting of the taper fluted and beadedrolls A and B, one being secured to a rotating, and the other to apivoted, shaft or journal, substantially as and for the purpose setforth.

JOHN E. HUNTER.

Witnesses:

WILLIAM OARTMELL, E. D. DoNLEY.

